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Flow Chart of Troubleshooting
9-25
9-15. GSM900 Transmitter
Resolder U101
Yes
Yes
No
No
Check & Resolder
L113
And PMU Part
U101
pin 27,28,29,30
≥
0.2Vp_p
Check UCP200
END
U101
pin 4
≥
2.8V
Check VBAT or PAM
control signal
No
Change or Resolder PAM100
Yes
PAM100 Pin17
≥
30 dBm
Resolder
PAM100,L100,C106,C102
TX ON (5Level)
Check PAM100
pin4 = H
Pin5 = L
PAM100 pin127
≥
30dBm
PAM100 pin27
≥
-4dBm
Check Tx Module
control circuit
Yes
Check PAM100
VBATT(pin30) OK?
Check UCP200
Yes
Yes
Yes
No
No
No
No
Yes
Содержание GT-M2710L
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